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  1. Good day. I have the problem more specifically for the first time I write so sorry for something I do wrong … I have macbook … I have bought minecraft and I want to play on my pc skyexchange. but I can not run it … Specifically I tried it to run through TechnicLauncher and then also through twitch launcher. after running this mode, it will write to me. Java HotSpot™ 64-Bit Server VM warning: ignoring option PermSize=256m; support was removed in 8.0 [10:18:07] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker [10:18:07] [main/ERROR]: Unable to launch java.lang.ClassNotFoundException: net.minecraftforge.fml.common.launcher.FMLTweaker at ~[?:1.8.0_161] at java.lang.ClassLoader.loadClass( ~[?:1.8.0_161] at sun.misc.Launcher$AppClassLoader.loadClass( ~[?:1.8.0_161] at java.lang.ClassLoader.loadClass( ~[?:1.8.0_161] at net.minecraft.launchwrapper.LaunchClassLoader.findClass( ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass( ~[?:1.8.0_161] at java.lang.ClassLoader.loadClass( ~[?:1.8.0_161] at java.lang.Class.forName0(Native Method) ~[?:1.8.0_161] at java.lang.Class.forName( ~[?:1.8.0_161] at net.minecraft.launchwrapper.Launch.launch( [launchwrapper-1.12.jar:?] at net.minecraft.launchwrapper.Launch.main( [launchwrapper-1.12.jar:?] thank you in advance and help me please.